Add Apps.AppListSearchResultDistanceFromOrigin UMA stat.

ui/app_list/views/search_result_tile_item_list_view.h

Index: ui/app_list/views/search_result_tile_item_list_view.h
diff --git a/ui/app_list/views/search_result_tile_item_list_view.h b/ui/app_list/views/search_result_tile_item_list_view.h
index 6a063ae248793026129b0177eb862e7cefe97122..13e1c7d615b0b9ffb99cdd808f51ca13c2b3e5ae 100644
--- a/ui/app_list/views/search_result_tile_item_list_view.h
+++ b/ui/app_list/views/search_result_tile_item_list_view.h
@@ -30,6 +30,8 @@ class APP_LIST_EXPORT SearchResultTileItemListView
   // Overridden from SearchResultContainerView:
   void OnContainerSelected(bool from_bottom,
                            bool directional_movement) override;
+  void NotifyFirstResultYIndex(int y_index) override;
+  int GetYSize() override;
 
   // Overridden from views::View:
   bool OnKeyPressed(const ui::KeyEvent& event) override;